Definition of Speed of light

1. Noun. The speed at which light travels in a vacuum; the constancy and universality of the speed of light is recognized by defining it to be exactly 299,792,458 meters per second.

Exact synonyms: C, Light Speed
Generic synonyms: Constant, Speed, Velocity



Definition of Speed of light

1. Noun. (physics) The speed of electromagnetic radiation in a perfect vacuum: exactly 299,792,458 metres per second by definition. ¹

¹ Source: wiktionary.com

Speed Of Light Pictures

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Lexicographical Neighbors of Speed Of Light

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speed of light (current term)
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Literary usage of Speed of light

Below you will find example usage of this term as found in modern and/or classical literature:

1. The Encyclopedia Americana: A Library of Universal Knowledge (1918)
"... ary or moving with a speed that is small in comparison with the speed of light; m being its mass, in grammes, when the electric charge is absent. ..."

2. The Encyclopædia Britannica: A Dictionary of Arts, Sciences, Literature and by Hugh Chisholm (1911)
"The fundamental constant at the basis of the whole theory ¬°s the speed of light in a vacuum, such as the celestial spaces. The question of the relation ..."

3. The Encyclopedia Americana: A Library of Universal Knowledge (1920)
"... the ratio of the speed of light in air to the speed of light in that medium. To Newton we owe two capital discoveries concerning the nature of light. ..."

4. The Monist by Hegeler Institute (1921)
"If from a gun moving with the speed of light a ball were discharged with the speed of light, ... No additions to the speed of light can increase that speed. ..."

5. Proceedings of the American Philosophical Society Held at Philadelphia for by American Philosophical Society (1897)
"19, where the two blocks are seen to be withdrawing from each other with the speed of light. They again rush to the termini of the line, where they undergo ..."

6. The Encyclopedia Americana: A Library of Universal Knowledge (1918)
"... light requires 499.67 seconds to pass over the distance which separates the sun from the earth. Multiplying this by the speed of light, we have, ..."

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